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|
# vim: ts=2
{
config,
lib,
pkgs,
...
}: let
cfg = config.system.fileSystemLayouts;
defaultMountOptions = [
"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
];
in {
options.system.fileSystemLayouts = {
enable = lib.mkEnableOption (lib.mdDoc "fileSystemLayout");
mainDisk = lib.mkOption {
type = lib.types.path;
example = lib.literalExpression "/dev/disk/by-uuid/0442cb6d-f13a-4635-b487-fa76189774c5";
description = lib.mdDoc "Path to the main disk";
};
efiDisk = lib.mkOption {
type = lib.types.path;
example = lib.literalExpression "/dev/disk/by-uuid/5143-6136";
description = lib.mdDoc "Path to the main disk";
};
ssd = lib.mkOption {
type = lib.types.bool;
example = lib.literalExpression "true";
default = false;
description = lib.mdDoc "Enable ssd specific improvements?";
};
swap = {
uuid = lib.mkOption {
type = lib.types.str;
example = lib.literalExpression "d1d20ae7-3d8a-44da-86da-677dbbb10c89";
description = lib.mdDoc "The uuid of the swapfile";
};
resumeOffset = lib.mkOption {
type = lib.types.str;
example = lib.literalExpression "134324224";
description = lib.mdDoc "The resume offset of the swapfile";
};
};
};
config = lib.mkIf cfg.enable {
systemd = {
services = {
hibernate-preparation = {
wantedBy = ["systemd-hibernate.service"];
unitConfig = {
Description = "Enable swap file and disable zram before hibernate";
Before = "systemd-hibernate.service";
};
serviceConfig = {
Type = "oneshot";
User = "root";
ExecStart = "${pkgs.dash}/bin/dash -c \"${pkgs.util-linux}/bin/swapon /swap/swapfile && ${pkgs.util-linux}/bin/swapoff /dev/zram0\"";
};
};
hibernate-resume = {
wantedBy = ["hibernate.target"];
unitConfig = {
Description = "Disable swap after resuming from hibernation";
After = "hibernate.target";
};
serviceConfig = {
Type = "oneshot";
User = "root";
ExecStart = "${pkgs.util-linux}/bin/swapoff /swap/swapfile";
};
};
systemd-hibernate.serviceConfig.Environment = "SYSTEMD_BYPASS_HIBERNATION_MEMORY_CHECK=1";
systemd-logind.serviceConfig.Environment = "SYSTEMD_BYPASS_HIBERNATION_MEMORY_CHECK=1";
};
timers.fstrim = lib.mkIf cfg.ssd {
wantedBy = ["timers.target"];
wants = ["fstrim.service"];
unitConfig = {
Description = "Discard unused blocks once a week";
Documentation = "man:fstrim";
ConditionVirtualization = "!container";
ConditionPathExists = "!/etc/initrd-release";
};
timerConfig = {
OnCalendar = "weekly";
AccuracySec = "1h";
Persistent = "true";
RandomizedDelaySec = "6000";
};
};
services.fstrim = lib.mkIf cfg.ssd {
unitConfig = {
Description = "Discard unused blocks on filesystems from /etc/fstab";
Documentation = "man:fstrim(8)";
ConditionVirtualization = "!container";
};
serviceConfig = {
Type = "oneshot";
ExecStart = "${pkgs.util-linux}/bin/fstrim --listed-in /etc/fstab:/proc/self/mountinfo --verbose --quiet-unsupported";
PrivateDevices = "no";
PrivateNetwork = "yes";
PrivateUsers = "no";
ProtectKernelTunables = "yes";
ProtectKernelModules = "yes";
ProtectControlGroups = "yes";
MemoryDenyWriteExecute = "yes";
SystemCallFilter = "@default @file-system @basic-io @system-service";
};
};
};
fileSystems = {
"/" = {
device = "none";
fsType = "tmpfs";
options = ["defaults" "size=4G" "mode=755"];
};
"/nix" = {
device = cfg.mainDisk;
fsType = "btrfs";
options = ["subvol=nix-store"] ++ defaultMountOptions;
};
"/srv" = {
device = cfg.mainDisk;
fsType = "btrfs";
neededForBoot = true;
options = ["subvol=persistent-storage"] ++ defaultMountOptions;
};
"/swap" = {
device = cfg.mainDisk;
fsType = "btrfs";
neededForBoot = true;
options = ["subvol=swap"] ++ defaultMountOptions;
};
"/boot" = {
device = cfg.efiDisk;
fsType = "vfat";
};
};
swapDevices = [];
zramSwap = {
enable = true;
priority = 10; # needs to be higher than harware-swap
};
boot.kernelParams = [
"resume=UUID=${cfg.swap.uuid}"
"resume_offset=${cfg.swap.resumeOffset}"
"zswap.enabled=0" # zswap and zram are not really compatible
];
};
}
|
