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|
# vim: ts=2
{
config,
lib,
...
}:
with lib; 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 = mkEnableOption (mdDoc "fileSystemLayout");
mainDisk = mkOption {
type = lib.types.path;
example = literalExpression "/dev/disk/by-uuid/0442cb6d-f13a-4635-b487-fa76189774c5";
description = lib.mdDoc "Path to the main disk";
};
efiDisk = mkOption {
type = lib.types.path;
example = literalExpression "/dev/disk/by-uuid/5143-6136";
description = lib.mdDoc "Path to the main disk";
};
ssd = mkOption {
type = lib.types.bool;
example = literalExpression "true";
default = false;
description = lib.mdDoc "Enable ssd specific improvements?";
};
swap = {
uuid = mkOption {
type = lib.types.str;
example = literalExpression "d1d20ae7-3d8a-44da-86da-677dbbb10c89";
description = lib.mdDoc "The uuid of the swapfile";
};
resumeOffset = mkOption {
type = lib.types.int;
example = literalExpression "134324224";
description = lib.mdDoc "The resume offset of the swapfile";
};
};
};
config = mkIf cfg.enable {
systemd = mkIf cfg.ssd {
timers.fstrim = {
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 = {
unitConfig = {
Description = "Discard unused blocks on filesystems from /etc/fstab";
Documentation = "man:fstrim(8)";
ConditionVirtualization = "!container";
};
serviceConfig = {
Type = "oneshot";
ExecStart = "/usr/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 = [
{
device = "/swap/swapfile";
discardPolicy = "both"; # TODO this is the default in swapon, so it should be fine?
priority = 1; # should not be used, aside of hibernate
}
];
zramSwap = {
enable = true;
priority = 10; # needs to be higher than harware-swap
};
boot.kernelParams = [
"resume=UUID=${cfg.swap.uuid}"
"resume_offset=${cfg.swap.resumeOffset}"
];
};
}
|
