32e8e16e1e
This is just intended as a local backup in case things go wrong horribly, so you can revert to a recent state. Change-Id: I1d666bad77045a1c807204df144422ba69d1d99f Reviewed-on: https://cl.tvl.fyi/c/depot/+/10417 Autosubmit: sterni <sternenseemann@systemli.org> Reviewed-by: sterni <sternenseemann@systemli.org> Tested-by: BuildkiteCI
125 lines
3.7 KiB
Nix
125 lines
3.7 KiB
Nix
# Companion module to minecraft-fabric.nix which automatically and regularly
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# creates backups of all minecraft servers' worlds to a shared borg(1)
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# repository.
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#
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# SPDX-License-Identifier: MIT
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# SPDX-FileCopyrightText: 2023 sterni <sternenseemann@systemli.org>
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{ pkgs, depot, config, lib, ... }:
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let
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inherit (depot.nix) getBins;
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bins = getBins pkgs.borgbackup [ "borg" ]
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// getBins pkgs.mcrcon [ "mcrcon" ];
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unvaried = ls: builtins.all (l: l == builtins.head ls) ls;
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cfg = config.services.backup-minecraft-fabric-servers;
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instances = lib.filterAttrs (_: i: i.enable) config.services.minecraft-fabric-server;
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users = lib.mapAttrsToList (_: i: i.user) instances;
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groups = lib.mapAttrsToList (_: i: i.group) instances;
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mkBackupScript = instanceName: instanceCfg:
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let
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archivePrefix = "minecraft-fabric-${instanceName}-world-${builtins.baseNameOf instanceCfg.world}-";
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in
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pkgs.writeShellScript "backup-minecraft-fabric-${instanceName}" ''
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export MCRCON_HOST="localhost"
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export MCRCON_PORT="${toString instanceCfg.serverProperties."rcon.port"}"
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# Unfortunately, mcrcon can't read the password from a file
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export MCRCON_PASS="$(cat "''${CREDENTIALS_DIRECTORY}/${instanceName}-rcon-password")"
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${bins.mcrcon} save-all
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unset MCRCON_PASS
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# Give the server plenty of time to save
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sleep 60
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${bins.borg} ${lib.escapeShellArgs [
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"create"
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"--verbose" "--filter" "AMEU" "--list"
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"--stats" "--show-rc"
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"--compression" "zlib"
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"${cfg.repository}::${archivePrefix}{now}"
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instanceCfg.world
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]}
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${bins.borg} ${lib.escapeShellArgs [
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"prune"
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"--list"
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"--show-rc"
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"--glob-archives" "${archivePrefix}*"
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"--keep-hourly" "168"
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"--keep-daily" "31"
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"--keep-monthly" "6"
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"--keep-yearly" "2"
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cfg.repository
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]}
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${bins.borg} compact ${lib.escapeShellArg cfg.repository}
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'';
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in
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{
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imports = [
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./minecraft-fabric.nix
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];
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options = {
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services.backup-minecraft-fabric-servers = {
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enable = lib.mkEnableOption "backups of all Minecraft fabric servers";
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repository = lib.mkOption {
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type = lib.types.path;
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description = "Path to the borg(1) repository to use for all backups.";
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default = "/var/lib/backup/minecraft-fabric";
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};
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};
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};
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config = lib.mkIf (cfg.enable && builtins.length (builtins.attrNames instances) > 0) {
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assertions = [
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{
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assertion = unvaried users && unvaried groups;
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message = "all instances under services.minecraft-fabric-server must use the same user and group";
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}
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];
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environment.systemPackages = [
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pkgs.borgbackup
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];
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systemd = {
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services.backup-minecraft-fabric-servers = {
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description = "Backup world of all fabric based Minecraft servers";
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wantedBy = [ ];
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after = builtins.map
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(name: "minecraft-fabric-${name}.service")
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(builtins.attrNames instances);
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script = lib.concatStrings (lib.mapAttrsToList mkBackupScript instances);
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serviceConfig = {
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Type = "oneshot";
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User = builtins.head users;
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Group = builtins.head groups;
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LoadCredential = lib.mapAttrsToList
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(instanceName: instanceCfg: "${instanceName}-rcon-password:${instanceCfg.rconPasswordFile}")
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instances;
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};
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};
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timers.backup-minecraft-fabric-servers = {
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description = "Regularly backup Minecraft fabric servers";
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wantedBy = [ "timers.target" ];
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timerConfig = {
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OnCalendar = "*-*-* 00/3:00:00";
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Persistent = true;
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RandomizedDelaySec = "1h";
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};
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};
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};
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};
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}
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