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|
{ config, lib, ... }:
with lib;
let
cfg = config.nix.gc;
in
{
###### interface
options = {
nix.gc = {
automatic = mkOption {
default = false;
type = types.bool;
description = "Automatically run the garbage collector at a specific time.";
};
dates = mkOption {
type = types.str;
default = "03:15";
example = "weekly";
description = ''
How often or when garbage collection is performed. For most desktop and server systems
a sufficient garbage collection is once a week.
The format is described in
<citerefentry><refentrytitle>systemd.time</refentrytitle>
<manvolnum>7</manvolnum></citerefentry>.
'';
};
randomizedDelaySec = mkOption {
default = "0";
type = types.str;
example = "45min";
description = ''
Add a randomized delay before each automatic upgrade.
The delay will be chosen between zero and this value.
This value must be a time span in the format specified by
<citerefentry><refentrytitle>systemd.time</refentrytitle>
<manvolnum>7</manvolnum></citerefentry>
'';
};
persistent = mkOption {
default = true;
type = 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.
'';
};
options = mkOption {
default = "";
example = "--max-freed $((64 * 1024**3))";
type = types.str;
description = ''
Options given to <filename>nix-collect-garbage</filename> when the
garbage collector is run automatically.
'';
};
};
};
###### implementation
config = {
assertions = [
{
assertion = cfg.automatic -> config.nix.enable;
message = ''nix.gc.automatic requires nix.enable'';
}
];
systemd.services.nix-gc = lib.mkIf config.nix.enable {
description = "Nix Garbage Collector";
script = "exec ${config.nix.package.out}/bin/nix-collect-garbage ${cfg.options}";
startAt = optional cfg.automatic cfg.dates;
};
systemd.timers.nix-gc = lib.mkIf cfg.automatic {
timerConfig = {
RandomizedDelaySec = cfg.randomizedDelaySec;
Persistent = cfg.persistent;
};
};
};
}
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