nixpkgs/modules/services/misc/nix-gc.nix

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{ config, pkgs, ... }:
with pkgs.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 specified dates.
";
};
dates = mkOption {
default = "15 03 * * *";
type = types.string;
description = "
Run the garbage collector at specified dates to avoid full
hard-drives.
";
};
options = mkOption {
default = "";
example = "--max-freed $((64 * 1024**3))";
type = types.string;
description = "
Options given to <filename>nix-collect-garbage</filename> when the
garbage collector is run automatically.
";
};
};
};
###### implementation
config = {
services.cron.systemCronJobs = mkIf cfg.automatic (singleton
"${cfg.dates} root ${config.system.build.systemd}/bin/systemctl start nix-gc.service");
systemd.services."nix-gc" =
{ description = "Nix Garbage Collector";
path = [ config.environment.nix ];
script = "exec nix-collect-garbage ${cfg.options}";
};
};
}