29027fd1e1
Using pkgs.lib on the spine of module evaluation is problematic because the pkgs argument depends on the result of module evaluation. To prevent an infinite recursion, pkgs and some of the modules are evaluated twice, which is inefficient. Using ‘with lib’ prevents this problem.
66 lines
1.8 KiB
Nix
66 lines
1.8 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let cfg = config.services.rsnapshot;
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in
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{
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options = {
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services.rsnapshot = {
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enable = mkEnableOption "rsnapshot backups";
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extraConfig = mkOption {
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default = "";
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example = ''
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retains hourly 24
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retain daily 365
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backup /home/ localhost/
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'';
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type = types.lines;
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description = ''
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rsnapshot configuration option in addition to the defaults from
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rsnapshot and this module.
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Note that tabs are required to separate option arguments, and
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directory names require trailing slashes.
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The "extra" in the option name might be a little misleading right
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now, as it is required to get a functional configuration.
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'';
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};
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cronIntervals = mkOption {
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default = {};
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example = { "hourly" = "0 * * * *"; "daily" = "50 21 * * *"; };
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type = types.attrsOf types.string;
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description = ''
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Periodicity at which intervals should be run by cron.
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Note that the intervals also have to exist in configuration
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as retain options.
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'';
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};
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};
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};
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config = mkIf cfg.enable (let
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myRsnapshot = pkgs.rsnapshot.override { configFile = rsnapshotCfg; };
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rsnapshotCfg = with pkgs; writeText "gen-rsnapshot.conf" (''
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config_version 1.2
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cmd_cp ${coreutils}/bin/cp
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cmd_rsync ${rsync}/bin/rsync
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cmd_ssh ${openssh}/bin/ssh
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cmd_logger ${inetutils}/bin/logger
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cmd_du ${coreutils}/bin/du
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lockfile /run/rsnapshot.pid
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${cfg.extraConfig}
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'');
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in {
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environment.systemPackages = [ myRsnapshot ];
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services.cron.systemCronJobs =
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mapAttrsToList (interval: time: "${time} root ${myRsnapshot}/bin/rsnapshot ${interval}") cfg.cronIntervals;
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}
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);
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}
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