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|
{
config,
pkgs,
lib,
modulesPath,
...
}:
let
cfg = config.depot.disk;
inherit (lib)
mkIf
mkDefault
types
;
in
{
imports = [
(modulesPath + "/installer/scan/not-detected.nix")
(modulesPath + "/image/file-options.nix")
];
options.depot.disk = {
enable = lib.mkEnableOption "Apply depot-standard ZFS disk layout.";
persistHome = lib.mkEnableOption "Persist home directories.";
reserved = lib.mkOption {
type = types.ints.positive;
description = "Space (in GB) to reserve as unusable on disk.";
default = 10;
};
};
config = mkIf cfg.enable {
networking.hostId = builtins.substring 0 8 (builtins.hashString "md5" config.networking.hostName);
services = {
zfs.autoScrub.enable = true;
zfs.trim.enable = true;
sanoid = {
enable = true;
templates.default = {
autosnap = true;
autoprune = true;
hourly = 24;
daily = 14;
monthly = 1;
};
datasets."zroot/local/var" = {
useTemplate = [ "default" ];
recursive = true;
};
};
};
# With root running in memory, swap should be required unless
# otherwise specified
zramSwap.enable = mkDefault true;
boot = {
kernelParams = [
"nohibernate"
"elevator=none"
"rd.systemd.unit=rescue.target"
];
supportedFilesystems = [
"vfat"
"zfs"
];
zfs.devNodes = mkDefault "/dev/disk/by-partuuid";
loader.efi.canTouchEfiVariables = true;
loader.systemd-boot = {
enable = true;
memtest86.enable = true;
extraFiles."efi/ipxe.efi" = "${pkgs.ipxe}/ipxe.efi";
extraEntries."ipxe.conf" = ''
title iPXE
efi /efi/ipxe.efi
sortkey z-ipxe
'';
};
initrd = {
systemd.enable = true;
availableKernelModules = [
"xhci_pci"
"ahci"
"nvme"
"usb_storage"
"sd_mod"
"sdhci_pci"
];
};
};
services.getty.autologinUser = "root";
fileSystems = {
"/" = {
device = "nodev";
fsType = "tmpfs";
options = [
"defaults"
"size=2G"
"mode=755"
];
};
"/nix" = {
device = "zroot/local/nix";
fsType = "zfs";
};
"/boot" = {
device = "/dev/disk/by-partlabel/ESP";
fsType = "vfat";
options = [ "umask=0077" ];
};
};
boot.initrd.systemd.services."growroot" = {
description = "Grow main partition into any unused disk space.";
serviceConfig.Type = "oneshot";
# If dry-run fails, there is nothing to grow
serviceConfig.ExecCondition = "${pkgs.cloud-utils}/bin/growpart /dev/vda 2 --dry-run";
wantedBy = [ "zfs.target" ];
before = [ "zfs-import-zroot.service" ];
script = "growpart /dev/vda 2 --verbose";
};
boot.initrd.systemd.services."expand-zroot" = {
description = "Expand zroot to take up entire partition.";
serviceConfig.Type = "oneshot";
wantedBy = ["zfs.target"];
after = ["zfs-import-zroot.service"];
script = ''
# pull partuuid from zpool
GUID=$(zpool list -v --json | jq --raw-output '.pools.zroot.vdevs.[].name')
# re-mark pool as online with '-e' to expand
zpool online -e zroot $GUID
'';
};
boot.initrd.systemd.emergencyAccess = true;
boot.initrd.systemd.initrdBin = [
pkgs.cloud-utils
pkgs.util-linux
pkgs.busybox
pkgs.jq
pkgs.zfs
];
image.modules.depot =
{ config, modulesPath, ... }:
{
imports = [ (modulesPath + "/profiles/qemu-guest.nix") ];
image.extension = "qcow2";
system.build.image = pkgs.depot.make-zfs-image.override {
inherit pkgs lib config;
inherit (config.image) fileName extension;
};
};
# datasets =
# let
# inherit (lib)
# genAttrs
# ;
# mounts = [
# # Any machine importing this configuration will require a
# # nix store, so it needs to survive reboots.
# "nix"
# # Although it goes against the idea of putting root on a
# # tmpfs, SystemD stores useful state for timers, services,
# # logs, etc. in var.
# "var"
# # Most machines using this module do not define additional
# # users, so /root should persist as the only "home" on the
# # system.
# "root"
# # General storage that should outlive a reboot. Paths
# # mentioned in Nix configs should generally use this
# # directory rather than /var or other directories that
# # happen to also be saved.
# "persist"
# ] ++ lib.optional cfg.persistHome "home";
# makeDataset = name: {
# type = "zfs_fs";
# mountpoint = "/${name}";
# options.mountpoint = "legacy";
# };
# in
# genAttrs mounts makeDataset
# // {
# # ZFS should not use all available space on a device. This
# # reserves some space at pool creation time that is never mounted
# # to ensure it never happens.
# reserved = {
# type = "zfs_fs";
# options = {
# refreservation = "${toString cfg.reserved}G";
# mountpoint = "none";
# };
# };
# };
# };
};
}
|
