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|
{ config, lib, ... }:
let
cfg = config.nix.optimise;
in
{
options = {
nix.optimise = {
automatic = lib.mkOption {
default = false;
type = lib.types.bool;
description = "Automatically run the nix store optimiser at a specific time.";
};
dates = lib.mkOption {
default = [ "03:45" ];
apply = lib.toList;
type = with lib.types; either singleLineStr (listOf str);
description = ''
Specification (in the format described by
{manpage}`systemd.time(7)`) of the time at
which the optimiser will run.
'';
};
randomizedDelaySec = lib.mkOption {
default = "1800";
type = lib.types.singleLineStr;
example = "45min";
description = ''
Add a randomized delay before the optimizer will run.
The delay will be chosen between zero and this value.
This value must be a time span in the format specified by
{manpage}`systemd.time(7)`
'';
};
persistent = lib.mkOption {
default = true;
type = lib.types.bool;
example = false;
description = ''
Takes a boolean argument. If true, the time when the service
unit was last triggered is stored on disk. When the timer is
activated, the service unit is triggered immediately if it
would have been triggered at least once during the time when
the timer was inactive. Such triggering is nonetheless
subject to the delay imposed by RandomizedDelaySec=. This is
useful to catch up on missed runs of the service when the
system was powered down.
'';
};
};
};
config = {
assertions = [
{
assertion = cfg.automatic -> config.nix.enable;
message = "nix.optimise.automatic requires nix.enable";
}
];
systemd = lib.mkIf config.nix.enable {
services.nix-optimise = {
description = "Nix Store Optimiser";
unitConfig = {
ConditionACPower = true;
# No point this if the nix daemon (and thus the nix store) is outside
ConditionPathIsReadWrite = "/nix/var/nix/daemon-socket";
};
serviceConfig = {
ExecStart = "${lib.getExe' config.nix.package "nix-store"} --optimise";
Nice = 19;
CPUSchedulingPolicy = "idle";
IOSchedulingClass = "idle";
};
startAt = lib.optionals cfg.automatic cfg.dates;
# do not start and delay when switching
restartIfChanged = false;
};
timers.nix-optimise = lib.mkIf cfg.automatic {
timerConfig = {
RandomizedDelaySec = cfg.randomizedDelaySec;
Persistent = cfg.persistent;
};
};
};
};
}
|
