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galin-sgalin-s
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feat(modules/mcl-disko): Create ZFS configuration module
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‎modules/default.nix‎

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./pyroscope
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./folder-size-metrics
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./shard-split
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./mcl-disko
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];
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}

‎modules/mcl-disko/default.nix‎

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{ withSystem, inputs, ... }:
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{
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flake.modules.nixos.mcl-disko =
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{
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pkgs,
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config,
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lib,
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...
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}:
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with lib;
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let
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cfg = config.mcl.disko;
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in
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{
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imports = [
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inputs.disko.nixosModules.disko
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];
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options.mcl.disko = {
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enable = mkEnableOption "Enable Module";
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legacyBoot = mkOption {
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type = types.bool;
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default = false;
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example = true;
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description = "Declare if the configuration is for a Hetzner server or not";
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};
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swapSize = mkOption {
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type = types.str;
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default = "32G";
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example = "32768M";
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description = "The size of the hard disk space used when RAM is full";
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};
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espSize = mkOption {
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type = types.str;
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default = "4G";
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example = "4096M";
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description = "The size of the hard disk space used for the ESP filesystem";
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};
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disks = mkOption {
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type = types.listOf types.str;
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default = [ ];
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example = [
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"/dev/disk/sda"
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"/dev/disk/sdb"
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"/dev/disk/sdc"
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];
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description = "The disk partitions to be used when ZFS is being created";
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};
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zpool = {
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name = mkOption {
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type = types.str;
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default = "zfs_root";
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description = "The name of the ZFS Pool";
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};
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mode = mkOption {
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type = types.enum [
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"stripe"
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"mirror"
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"raidz1"
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"raidz2"
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"raidz3"
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];
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default = "stripe";
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description = "Set ZFS Pool redundancy - e.g. 'mirror', 'raidz1', etc.";
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};
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extraDatasets = mkOption {
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type = types.attrsOf (
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types.submodule (
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{ name, ... }:
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{
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options = {
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mountpoint = mkOption {
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type = types.nullOr types.str;
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default = name;
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example = "/var/lib";
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description = "The ZFS dataset mountpoint";
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};
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type = mkOption {
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type = types.enum [
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"zfs_fs"
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"zfs_volume"
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];
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default = "zfs_fs";
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description = "Type of ZFS dataset";
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};
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snapshot = mkEnableOption "Whether to enable ZFS snapshots";
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};
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}
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)
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);
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default = { };
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example = {
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"/opt".snapshot = false;
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"/opt/downloads".snapshot = false;
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"/opt/downloads/vm-images" = {
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snapshot = false;
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options = {
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quota = "120G";
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};
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};
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};
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description = "Extra ZFS Pool datasets";
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};
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};
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};
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config.disko =
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let
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makePrimaryZfsDisk = import ./primaryZfsPartition.nix;
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makeSecondaryZfsDisk = import ./secondaryZfsPartition.nix;
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first = builtins.head cfg.disks;
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rest = builtins.tail cfg.disks;
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secondaryDisks = builtins.listToAttrs (
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builtins.map (disk: {
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name = disk;
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value =
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if cfg.zpool.mode != "stripe" then
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makePrimaryZfsDisk {
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disk = first;
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espSize = cfg.espSize;
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swapSize = cfg.swapSize;
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legacyBoot = cfg.legacyBoot;
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poolName = cfg.zpool.name;
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}
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else
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makeSecondaryZfsDisk {
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poolName = cfg.zpool.name;
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inherit disk;
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};
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}) rest
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);
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in
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lib.mkIf cfg.enable {
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devices = {
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disk = secondaryDisks // {
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"${first}" = makePrimaryZfsDisk {
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disk = first;
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espSize = cfg.espSize;
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swapSize = cfg.swapSize;
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legacyBoot = cfg.legacyBoot;
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poolName = cfg.zpool.name;
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};
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};
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zpool = import ./zpool.nix {
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poolName = cfg.zpool.name;
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poolMode = cfg.zpool.mode;
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poolExtraDatasets = cfg.zpool.extraDatasets;
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inherit lib;
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};
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};
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};
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};
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}

‎modules/mcl-disko/primaryZfsPartition.nix‎

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{
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disk,
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espSize,
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swapSize,
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legacyBoot,
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poolName,
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}:
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{
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type = "disk";
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device = disk;
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content = {
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type = "gpt";
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partitions = {
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ESP = {
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device = "${disk}-part1";
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priority = 0;
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size = espSize;
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type = "EF00";
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content = {
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type = "filesystem";
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format = "vfat";
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mountpoint = "/boot";
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mountOptions = [ "umask=0077" ];
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};
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};
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zfs = {
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device = "${disk}-part2";
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priority = 1;
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end = "-${swapSize}";
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type = "BF00";
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content = {
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type = "zfs";
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pool = "${poolName}";
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};
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};
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swap = {
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device = "${disk}-part3";
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priority = 2;
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size = if legacyBoot == true then "100%" else swapSize;
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content = {
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type = "swap";
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randomEncryption = true;
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};
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};
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};
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};
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}

‎modules/mcl-disko/secondaryZfsPartition.nix‎

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{ poolName, disk }:
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{
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type = "disk";
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device = disk;
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content = {
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type = "gpt";
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partitions = {
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zfs = {
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device = "${disk}-part1";
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size = "100%";
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content = {
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type = "zfs";
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pool = "${poolName}";
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};
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};
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};
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};
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}

‎modules/mcl-disko/zpool.nix‎

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{
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lib,
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poolName,
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poolMode,
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poolExtraDatasets,
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}:
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let
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translateDataSetToDiskoConfig =
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dataset@{ snapshot, ... }:
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lib.recursiveUpdate dataset {
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type = "zfs_fs";
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options = {
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"com.sun:auto-snapshot" = if dataset.snapshot then "on" else "off";
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canmount = "on";
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};
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};
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restructuredDatasets = builtins.mapAttrs (
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n: v: (builtins.removeAttrs (translateDataSetToDiskoConfig poolExtraDatasets.${n}) [ "snapshot" ])
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) poolExtraDatasets;
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in
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{
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${poolName} = {
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type = "zpool";
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mode = if poolMode == "stripe" then "" else poolMode;
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rootFsOptions = {
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acltype = "posixacl";
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atime = "off";
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canmount = "off";
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checksum = "sha512";
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compression = "lz4";
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xattr = "sa";
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mountpoint = "none";
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"com.sun:auto-snapshot" = "false";
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};
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options = {
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autotrim = "on";
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listsnapshots = "on";
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};
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postCreateHook = "zfs snapshot ${poolName}@blank";
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datasets = {
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root = {
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mountpoint = "/";
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type = "zfs_fs";
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options = {
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"com.sun:auto-snapshot" = "false";
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mountpoint = "legacy";
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};
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};
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"root/nix" = {
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mountpoint = "/nix";
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type = "zfs_fs";
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options = {
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"com.sun:auto-snapshot" = "false";
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canmount = "on";
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mountpoint = "legacy";
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refreservation = "100GiB";
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};
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};
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"root/var" = {
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mountpoint = "/var";
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type = "zfs_fs";
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options = {
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"com.sun:auto-snapshot" = "true";
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canmount = "on";
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mountpoint = "legacy";
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};
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};
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"root/var/lib" = {
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mountpoint = "/var/lib";
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type = "zfs_fs";
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options = {
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"com.sun:auto-snapshot" = "true";
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canmount = "on";
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mountpoint = "legacy";
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};
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};
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"root/home" = {
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mountpoint = "/home";
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type = "zfs_fs";
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options = {
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"com.sun:auto-snapshot" = "true";
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canmount = "on";
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mountpoint = "legacy";
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refreservation = "200GiB";
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};
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};
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"root/var/lib/docker" = {
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mountpoint = "/var/lib/docker";
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type = "zfs_fs";
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options = {
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"com.sun:auto-snapshot" = "false";
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canmount = "on";
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mountpoint = "legacy";
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refreservation = "100GiB";
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};
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};
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"root/var/lib/containers" = {
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mountpoint = "/var/lib/containers";
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type = "zfs_fs";
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options = {
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"com.sun:auto-snapshot" = "false";
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canmount = "on";
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mountpoint = "legacy";
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refreservation = "100GiB";
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};
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};
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} // restructuredDatasets;
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};
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}

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