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Run the garbage collector as a systemd service

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Running it from systemd rather than cron has several advantages:
systemd ensures that only one instance runs at a time; the GC can be
manually started/stopped; and logging goes to the journal.

We still need cron to start the service at the right time, but
hopefully soon we can get rid of cron entirely (once systemd supports
starting a unit at a specific time).
This commit is contained in:
Eelco Dolstra 2013-01-04 14:04:41 +01:00
parent f701acfac0
commit baac242a1f
1 changed files with 14 additions and 5 deletions
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19
modules/services/misc/nix-gc.nix
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@ -16,7 +16,7 @@ in
automatic = mkOption {
default = false;
example = true;
type = types.bool;
description = "
Automatically run the garbage collector at specified dates.
";
@ -24,6 +24,7 @@ in
dates = mkOption {
default = "15 03 * * *";
type = types.string;
description = "
Run the garbage collector at specified dates to avoid full
hard-drives.
@ -33,6 +34,7 @@ in
options = mkOption {
default = "";
example = "--max-freed $((64 * 1024**3))";
type = types.string;
description = "
Options given to <filename>nix-collect-garbage</filename> when the
garbage collector is run automatically.
@ -45,10 +47,17 @@ in
###### implementation
config = mkIf cfg.automatic {
services.cron.systemCronJobs = [
"${cfg.dates} root ${nix}/bin/nix-collect-garbage ${cfg.options} > /var/log/gc.log 2>&1"
];
config = {
services.cron.systemCronJobs = mkIf cfg.automatic (singleton
"${cfg.dates} root ${config.system.build.systemd}/bin/systemctl start nix-gc.service");
boot.systemd.services."nix-gc" =
{ description = "Nix Garbage Collector";
serviceConfig.ExecStart =
"@${nix}/bin/nix-collect-garbage nix-collect-garbage ${cfg.options}";
};
};
}