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{ pkgs, config, ... }:
let
snapshotNames = ["frequent" "hourly" "daily" "monthly" "yearly"];
snapshotCount = {
frequent = 24;
hourly = 24;
daily = 30;
monthly = 12;
yearly = 5;
};
snapshotTimerConfig = {
frequent = { OnCalendar = "*:0/5 UTC"; Persistent = true; };
hourly = { OnCalendar = "hourly UTC"; Persistent = true; };
daily = { OnCalendar = "daily UTC"; Persistent = true; };
monthly = { OnCalendar = "monthly UTC"; Persistent = true; };
yearly = { OnCalendar = "yearly UTC"; Persistent = true; };
};
snapshotDescr = {
frequent = "few minutes";
hourly = "hour";
daily = "day";
monthly = "month";
yearly = "year";
};
zfs = config.boot.zfs.package;
autosnapPackage = pkgs.zfstools.override { inherit zfs; };
in {
config = {
fileSystems = {
"/nix" =
{ device = "surtr/local/nix";
fsType = "zfs";
};
"/root" =
{ device = "surtr/safe/home-root";
fsType = "zfs";
neededForBoot = true;
};
"/var/lib/systemd" =
{ device = "surtr/local/var-lib-systemd";
fsType = "zfs";
neededForBoot = true;
};
"/var/lib/nixos" =
{ device = "surtr/local/var-lib-nixos";
fsType = "zfs";
neededForBoot = true;
};
"/var/log" =
{ device = "surtr/local/var-log";
fsType = "zfs";
};
"/home" =
{ device = "surtr/safe/home";
fsType = "zfs";
};
"/srv" =
{ device = "surtr/safe/srv";
fsType = "zfs";
options = [ "zfsutil" ];
};
};
systemd.services =
let mkSnapService = snapName: {
name = "zfs-snapshot-${snapName}";
value = {
description = "ZFS auto-snapshot every ${snapshotDescr.${snapName}}";
after = [ "zfs-import.target" ];
serviceConfig = {
Type = "oneshot";
ExecStart = "${autosnapPackage}/bin/zfs-auto-snapshot -k -p -u ${snapName} ${toString snapshotCount.${snapName}}";
};
restartIfChanged = false;
preStart = ''
${zfs}/bin/zfs set com.sun:auto-snapshot=true surtr/safe
'';
};
};
in builtins.listToAttrs (map mkSnapService snapshotNames);
systemd.timers =
let mkSnapTimer = snapName: {
name = "zfs-snapshot-${snapName}";
value = {
wantedBy = [ "timers.target" ];
timerConfig = snapshotTimerConfig.${snapName};
};
};
in builtins.listToAttrs (map mkSnapTimer snapshotNames);
services.zfs.trim.enable = false;
services.zfs.autoScrub = {
enable = true;
interval = "Sun *-*-1..7 04:00:00";
};
};
}
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