diff options
Diffstat (limited to '')
| -rw-r--r-- | system/disks/default.nix | 120 | ||||
| -rw-r--r-- | system/disks/fstrim.nix | 44 | ||||
| -rw-r--r-- | system/disks/hibernate.nix | 42 |
3 files changed, 206 insertions, 0 deletions
diff --git a/system/disks/default.nix b/system/disks/default.nix new file mode 100644 index 00000000..33e1fa33 --- /dev/null +++ b/system/disks/default.nix @@ -0,0 +1,120 @@ +{ + config, + lib, + pkgs, + ... +}: let + cfg = config.soispha.disks; + 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.soispha.disks = { + disk = lib.mkOption { + type = lib.types.path; + example = lib.literalExpression "/dev/disk/by-uuid/0442cb6d-f13a-4635-b487-fa76189774c5"; + description = lib.mdDoc "The disk used for installing the OS"; + }; + ssd = lib.mkOption { + type = lib.types.bool; + example = lib.literalExpression "true"; + default = false; + description = lib.mdDoc "Enable ssd specific improvements, like trim"; + }; + 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 = { + systemd = lib.recursiveUpdate (import ./hibernate.nix {inherit pkgs;}) (import ./fstrim.nix {inherit pkgs lib cfg;}); + + disko.devices = { + disk = { + main = { + device = cfg.mainDisk; + content = { + type = "gpt"; + partitions = { + root = { + size = "100%"; + name = "root"; + content = { + type = "btrfs"; + extraArgs = ["-f"]; # Override existing partitions + subvolumes = { + "nix" = { + mountpoint = "/nix"; + mountOptions = defaultMountOptions; + }; + "persistent-storage" = { + mountpoint = "/srv"; + mountOptions = defaultMountOptions; + }; + "swap" = { + mountpoint = "/swap"; + mountOptions = defaultMountOptions; + }; + }; + }; + }; + boot = { + type = "EF00"; + size = "512M"; + name = "boot"; + content = { + type = "filesystem"; + format = "vfat"; + mountpoint = "/boot"; + }; + }; + }; + }; + }; + }; + nodev = { + "/" = { + fsType = "tmpfs"; + mountOptions = ["defaults" "size=4G" "mode=755"]; + }; + }; + }; + fileSystems = { + "/srv" = { + neededForBoot = true; + }; + "/swap" = { + neededForBoot = true; + }; + }; + swapDevices = [ + { + device = "/swap/swapfile"; + priority = 1; # lower than zramSwap, just in case + # size = 2048; # TODO can nixos create a btrfs swapfile correctly? + } + ]; + zramSwap = { + enable = true; + priority = 10; # needs to be higher than hardware-swap + }; + boot.kernelParams = [ + "resume=UUID=${cfg.swap.uuid}" + "resume_offset=${cfg.swap.resumeOffset}" + "zswap.enabled=0" # zswap and zram are not really compatible + ]; + }; +} +# vim: ts=2 + diff --git a/system/disks/fstrim.nix b/system/disks/fstrim.nix new file mode 100644 index 00000000..6a8da5be --- /dev/null +++ b/system/disks/fstrim.nix @@ -0,0 +1,44 @@ +{ + pkgs, + lib, + cfg, +}: { + 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 { + wantedBy = lib.mkForce []; + unitConfig = { + Description = "Discard unused blocks on filesystems from /etc/fstab"; + Documentation = "man:fstrim(8)"; + ConditionVirtualization = "!container"; + }; + serviceConfig = { + Type = "oneshot"; + ExecStart = "${pkgs.util-linux}/bin/fstrim --listed-in /etc/fstab:/proc/self/mountinfo --verbose --quiet-unsupported"; + PrivateDevices = "no"; + PrivateNetwork = "yes"; + PrivateUsers = "no"; + ProtectKernelTunables = "yes"; + ProtectKernelModules = "yes"; + ProtectControlGroups = "yes"; + MemoryDenyWriteExecute = "yes"; + SystemCallFilter = "@default @file-system @basic-io @system-service"; + }; + }; +} +# vim: ts=2 + diff --git a/system/disks/hibernate.nix b/system/disks/hibernate.nix new file mode 100644 index 00000000..5bb0f8d5 --- /dev/null +++ b/system/disks/hibernate.nix @@ -0,0 +1,42 @@ +{pkgs}: { + services = { + hibernate-preparation = { + # TODO check if they work + wantedBy = ["systemd-hibernate.service"]; + unitConfig = { + Description = "Enable swap file and disable zram before hibernate"; + Before = "systemd-hibernate.service"; + }; + serviceConfig = { + Type = "oneshot"; + User = "root"; + ExecStart = "${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"; + }; + }; + swapoff-start = { + wantedBy = ["multi-user.target"]; + unitConfig = { + Description = "Disable hardware swap after booting"; + }; + 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"; + }; +} |