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42 lines
992 B
Nix
42 lines
992 B
Nix
{ config, pkgs, ... }:
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{
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# Based on https://github.com/NixOS/nixpkgs/blob/nixos-23.11/nixos/modules/services/misc/nix-gc.nix
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assertions = [{
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assertion = config.nix.enable;
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message = ''nix-gc-7 requires nix.enable'';
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}];
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systemd.timers."nix-gc-7" = {
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wantedBy = [ "timers.target" ];
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partOf = [ "nix-gc-7.service" ];
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timerConfig = {
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OnCalendar = "weekly";
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Persistent = true;
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AccuracySec = "2d";
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RandomizedDelaySec = "1d";
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};
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};
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systemd.services."nix-gc-7" = {
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description = "Keep only the most recent 7 system generations";
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conflicts = [ "shutdown.target" "sleep.target" ];
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before = [ "shutdown.target" "sleep.target" ];
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serviceConfig = {
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Type = "oneshot";
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PrivateTmp = true;
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Nice = 19;
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IOSchedulingClass = "idle";
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};
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script = ''
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set -eu -o pipefail
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${config.nix.package.out}/bin/nix-env --delete-generations +7 --profile /nix/var/nix/profiles/system
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'';
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};
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}
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