docker service: add option to do automatic pruning
This allows to run the prune job periodically on a machine. By default the if enabled the job is run once a week. The structure is similar to how system.autoUpgrade works.
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@ -94,6 +94,37 @@ in
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<command>docker</command> daemon.
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'';
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};
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autoPrune = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to periodically prune Docker resources. If enabled, a systemd timer will run
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<literal>docker system prune -f</literal> once a day.
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'';
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};
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flags = mkOption {
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type = types.listOf types.str;
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default = [];
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example = [ "--all" ];
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description = ''
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Any additional flags passed to <command>docker system prune</command>.
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'';
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};
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dates = mkOption {
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default = "weekly";
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type = types.str;
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description = ''
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Specification (in the format described by
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<citerefentry><refentrytitle>systemd.time</refentrytitle>
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<manvolnum>7</manvolnum></citerefentry>) of the time at
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which the prune will occur.
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'';
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};
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};
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};
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###### implementation
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@ -137,6 +168,22 @@ in
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SocketGroup = "docker";
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};
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};
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systemd.services.docker-prune = {
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description = "Prune docker resources";
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restartIfChanged = false;
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unitConfig.X-StopOnRemoval = false;
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serviceConfig.Type = "oneshot";
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script = ''
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${pkgs.docker}/bin/docker system prune -f ${toString cfg.autoPrune.flags}
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'';
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startAt = optional cfg.autoPrune.enable cfg.autoPrune.dates;
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};
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}
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]);
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