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home-manager/modules/services/nix-gc.nix
shivaraj-bh 274bd470a5
nix-gc: add service
The nix-gc service runs automatically at a specified frequency. It is
managed via launchd on macOS and systemd on Linux.
2024-02-05 18:10:00 +01:00

121 lines
2.9 KiB
Nix

{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.nix.gc;
mkCalendarInterval = frequency:
let
freq = {
"hourly" = [{ Minute = 0; }];
"weekly" = [{
Weekday = 1;
Hour = 0;
Minute = 0;
}];
"monthly" = [{
Day = 1;
Hour = 0;
Minute = 0;
}];
"semiannually" = [
{
Month = 1;
Day = 1;
Hour = 0;
Minute = 0;
}
{
Month = 7;
Day = 1;
Hour = 0;
Minute = 0;
}
];
"annually" = [{
Month = 1;
Day = 1;
Hour = 0;
Minute = 0;
}];
};
in freq.${frequency};
nixPackage = if config.nix.enable && config.nix.package != null then
config.nix.package
else
pkgs.nix;
in {
meta.maintainers = [ maintainers.shivaraj-bh ];
options = {
nix.gc = {
automatic = mkOption {
type = types.bool;
default = false;
description = ''
Automatically run the garbage collector at a specific time.
Note: This will only garbage collect the current user's profiles.
'';
};
frequency = mkOption {
type =
types.enum [ "hourly" "weekly" "monthly" "semiannually" "annually" ];
default = "weekly";
example = "monthly";
description = ''
The frequency at which to run the garbage collector.
These enums are based on special expressions from the
{manpage}`systemd.time(7)`
'';
};
options = mkOption {
type = types.nullOr types.str;
default = null;
example = "--max-freed $((64 * 1024**3))";
description = ''
Options given to {file}`nix-collect-garbage` when the
garbage collector is run automatically.
'';
};
};
};
config = lib.mkIf cfg.automatic (mkMerge [
(mkIf pkgs.stdenv.isLinux {
systemd.user.services.nix-gc = {
Unit = { Description = "Nix Garbage Collector"; };
Service = {
ExecStart = "${nixPackage}/bin/nix-collect-garbage ${
lib.optionalString (cfg.options != null) cfg.options
}";
};
};
systemd.user.timers.nix-gc = {
Unit = { Description = "Nix Garbage Collector"; };
Timer = {
OnCalendar = "${cfg.frequency}";
Unit = "nix-gc.service";
};
Install = { WantedBy = [ "timers.target" ]; };
};
})
(mkIf pkgs.stdenv.isDarwin {
launchd.agents.nix-gc = {
enable = true;
config = {
ProgramArguments = [ "${nixPackage}/bin/nix-collect-garbage" ]
++ lib.optional (cfg.options != null) cfg.options;
StartCalendarInterval = mkCalendarInterval cfg.frequency;
};
};
})
]);
}