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106 lines
2.8 KiB
106 lines
2.8 KiB
{ config, lib, ... }:
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with lib;
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let
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cfg = config.nix.gc;
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in
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{
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###### interface
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options = {
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nix.gc = {
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automatic = mkOption {
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default = false;
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type = types.bool;
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description = "Automatically run the garbage collector at a specific time.";
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};
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dates = mkOption {
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type = types.str;
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default = "03:15";
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example = "weekly";
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description = ''
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How often or when garbage collection is performed. For most desktop and server systems
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a sufficient garbage collection is once a week.
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The format is described in
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<citerefentry><refentrytitle>systemd.time</refentrytitle>
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<manvolnum>7</manvolnum></citerefentry>.
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'';
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};
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randomizedDelaySec = mkOption {
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default = "0";
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type = types.str;
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example = "45min";
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description = ''
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Add a randomized delay before each garbage collection.
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The delay will be chosen between zero and this value.
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This value must be a time span in the format specified by
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<citerefentry><refentrytitle>systemd.time</refentrytitle>
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<manvolnum>7</manvolnum></citerefentry>
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'';
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};
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persistent = mkOption {
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default = true;
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type = types.bool;
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example = false;
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description = ''
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Takes a boolean argument. If true, the time when the service
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unit was last triggered is stored on disk. When the timer is
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activated, the service unit is triggered immediately if it
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would have been triggered at least once during the time when
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the timer was inactive. Such triggering is nonetheless
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subject to the delay imposed by RandomizedDelaySec=. This is
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useful to catch up on missed runs of the service when the
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system was powered down.
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'';
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};
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options = mkOption {
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default = "";
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example = "--max-freed $((64 * 1024**3))";
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type = types.str;
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description = ''
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Options given to <filename>nix-collect-garbage</filename> when the
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garbage collector is run automatically.
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'';
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};
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};
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};
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###### implementation
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config = {
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assertions = [
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{
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assertion = cfg.automatic -> config.nix.enable;
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message = ''nix.gc.automatic requires nix.enable'';
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}
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];
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systemd.services.nix-gc = lib.mkIf config.nix.enable {
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description = "Nix Garbage Collector";
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script = "exec ${config.nix.package.out}/bin/nix-collect-garbage ${cfg.options}";
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startAt = optional cfg.automatic cfg.dates;
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};
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systemd.timers.nix-gc = lib.mkIf cfg.automatic {
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timerConfig = {
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RandomizedDelaySec = cfg.randomizedDelaySec;
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Persistent = cfg.persistent;
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};
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};
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};
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}
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