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nixpkgs/nixos/modules/services/backup/rsnapshot.nix

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Nix

{ config, lib, pkgs, ... }:
with lib;
let cfg = config.services.rsnapshot;
in
{
options = {
services.rsnapshot = {
enable = mkEnableOption "rsnapshot backups";
extraConfig = mkOption {
default = "";
example = ''
retains hourly 24
retain daily 365
backup /home/ localhost/
'';
type = types.lines;
description = ''
rsnapshot configuration option in addition to the defaults from
rsnapshot and this module.
Note that tabs are required to separate option arguments, and
directory names require trailing slashes.
The "extra" in the option name might be a little misleading right
now, as it is required to get a functional configuration.
'';
};
cronIntervals = mkOption {
default = {};
example = { hourly = "0 * * * *"; daily = "50 21 * * *"; };
type = types.attrsOf types.string;
description = ''
Periodicity at which intervals should be run by cron.
Note that the intervals also have to exist in configuration
as retain options.
'';
};
package = mkOption {
type = types.package;
default = pkgs.rsnapshot;
example = literalExample "pkgs.rsnapshotGit";
description = ''
RSnapshot package to use.
'';
};
};
};
config = mkIf cfg.enable (let
myRsnapshot = cfg.package.override { configFile = rsnapshotCfg; };
rsnapshotCfg = with pkgs; writeText "gen-rsnapshot.conf" (''
config_version 1.2
cmd_cp ${coreutils}/bin/cp
cmd_rsync ${rsync}/bin/rsync
cmd_ssh ${openssh}/bin/ssh
cmd_logger ${inetutils}/bin/logger
cmd_du ${coreutils}/bin/du
lockfile /run/rsnapshot.pid
${cfg.extraConfig}
'');
in {
environment.systemPackages = [ myRsnapshot ];
services.cron.systemCronJobs =
mapAttrsToList (interval: time: "${time} root ${myRsnapshot}/bin/rsnapshot ${interval}") cfg.cronIntervals;
}
);
}