diff options
Diffstat (limited to 'nixos/modules/services/misc/nix-gc.nix')
-rw-r--r-- | nixos/modules/services/misc/nix-gc.nix | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/nixos/modules/services/misc/nix-gc.nix b/nixos/modules/services/misc/nix-gc.nix new file mode 100644 index 00000000000..a7a6a3b5964 --- /dev/null +++ b/nixos/modules/services/misc/nix-gc.nix @@ -0,0 +1,100 @@ +{ 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 = { + + systemd.services.nix-gc = { + 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; + }; + }; + + }; + +} |