From eb13a9a552f9e50a66faba985521ba8e3483c447 Mon Sep 17 00:00:00 2001
From: Kleidi Bujari <mail@4kb.net>
Date: Tue, 17 Dec 2024 23:03:27 -0500
Subject: Push configuration out of flake

Projects are not necessarily all exported by the system flake, and
should freely support other derivations. The new "mod" directory will be
used for most projects, and it can be imported by machine
configurations.

That said, the tooling around flakes is pretty good and will still be
used until the dependency is lessened.
---
 machines/xnet/disk.nix | 139 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 139 insertions(+)
 create mode 100644 machines/xnet/disk.nix

(limited to 'machines/xnet/disk.nix')

diff --git a/machines/xnet/disk.nix b/machines/xnet/disk.nix
new file mode 100644
index 0000000..caef61d
--- /dev/null
+++ b/machines/xnet/disk.nix
@@ -0,0 +1,139 @@
+{ config, lib, modulesPath, ... }:
+let
+  cfg = config.xnet.disk;
+  commonOpts = {
+    acltype = "posixacl";
+    atime = "off";
+    compression = "on";
+    normalization = "formD";
+    relatime = "off";
+    xattr = "sa";
+    "com.sun:auto-snapshot" = "false";
+  };
+
+  inherit (lib) mkOption mkDefault mkIf types;
+in
+{
+  imports = [
+    (modulesPath + "/installer/scan/not-detected.nix")
+  ];
+
+  options.xnet.disk = {
+    enable = mkOption {
+      type = types.bool;
+      default = false;
+      description = "Apply xnet-standard ZFS disk layout.";
+    };
+
+    device = mkOption {
+      type = types.str;
+      description = "Device used for zroot ZFS pool.";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    networking.hostId = builtins.substring 0 8
+      (builtins.hashString "md5" config.networking.hostName);
+
+    services.zfs = {
+      autoScrub.enable = true;
+      trim.enable = true;
+    };
+
+    # With root running in memory, swap should be required unless
+    # otherwise specified
+    zramSwap.enable = mkDefault true;
+
+    boot = {
+      kernelParams = [ "nohibernate" "elevator=none" ];
+      supportedFilesystems = [ "vfat" "zfs" ];
+      zfs.devNodes = "/dev/disk/by-partuuid";
+      loader = {
+        systemd-boot.enable = true;
+        efi.canTouchEfiVariables = true;
+      };
+      initrd = {
+        systemd.enable = true;
+        availableKernelModules = [
+          "xhci_pci"
+          "ahci"
+          "nvme"
+          "usb_storage"
+          "sd_mod"
+          "sdhci_pci"
+        ];
+      };
+      tmp.cleanOnBoot = mkDefault true;
+    };
+
+    disko.devices.disk.main = {
+      type = "disk";
+      device = cfg.device;
+      content = {
+        type = "gpt";
+        partitions.ESP = {
+          size = "1G";
+          type = "EF00";
+          content = {
+            type = "filesystem";
+            format = "vfat";
+            mountpoint = "/boot";
+          };
+        };
+        partitions.ZFS = {
+          size = "100%";
+          content = {
+            type = "zfs";
+            pool = "zroot";
+          };
+        };
+      };
+    };
+
+    disko.devices = {
+      nodev."/" = {
+        fsType = "tmpfs";
+        mountOptions = [ "defaults" "size=2G" "mode=755" ];
+      };
+
+      zpool.zroot = {
+        type = "zpool";
+        options = {
+          ashift = "12";
+          autotrim = "on";
+        };
+
+        datasets = {
+          "local" = {
+            type = "zfs_fs";
+            options = commonOpts // {
+              mountpoint = "none";
+            };
+          };
+
+          "local/nix" = {
+            type = "zfs_fs";
+            mountpoint = "/nix";
+            options.mountpoint = "legacy";
+          };
+
+          "local/reserved" = {
+            type = "zfs_fs";
+            options = {
+              refreservation = "10G";
+              mountpoint = "none";
+            };
+          };
+
+          "persist" = {
+            type = "zfs_fs";
+            mountpoint = "/persist";
+            options = commonOpts // {
+              mountpoint = "legacy";
+            };
+          };
+        };
+      };
+    };
+  };
+}
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