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nixfiles/modules/minecraft-server/default.nix

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2021-02-10 19:10:04 +01:00
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.clerie.minecraft-server;
# We don't allow eula=false anyways
eulaFile = builtins.toFile "eula.txt" ''
# eula.txt managed by NixOS Configuration
eula=true
'';
generateServerUnit = name: server: (
nameValuePair "minecraft-server-${name}" (mkIf server.enable {
description = "Minecraft Server ${name}";
wantedBy = [ "multi-user.target" ];
after = [ "network.target" ];
serviceConfig = {
ExecStart = "${server.package}/bin/minecraft-server ${server.jvmOpts}";
Restart = "always";
WorkingDirectory = if server.dataDir != null then server.dataDir else "/var/lib/minecraft-server-${name}";
StateDirectory = "minecraft-server-${name}";
DynamicUser = true;
};
preStart = ''
ln -sf ${eulaFile} eula.txt
'';
})
);
serverOpts = { config, ... }@moduleAttrs: {
options = {
enable = mkEnableOption "A shared minecraft hosting service.";
dataDir = mkOption {
type = with types; nullOr path;
default = null;
description = ''
Directory to store Minecraft database and other state/data files.
When null defaulting to /var/lib/minecraft-server-${name}
'';
};
package = mkOption {
type = types.package;
default = pkgs.papermc;
defaultText = "pkgs.papermc";
example = literalExample "pkgs.minecraft-server_1_12_2";
description = "Version of minecraft-server to run.";
};
jvmOpts = mkOption {
type = types.separatedString " ";
default = "-Xmx2G -Xms1G";
# Example options from https://minecraft.gamepedia.com/Tutorials/Server_startup_script
example = "-Xmx2048M -Xms4092M -XX:+UseG1GC -XX:+CMSIncrementalPacing "
+ "-XX:+CMSClassUnloadingEnabled -XX:ParallelGCThreads=2 "
+ "-XX:MinHeapFreeRatio=5 -XX:MaxHeapFreeRatio=10";
description = "JVM options for the Minecraft server.";
};
};
};
in {
options = {
clerie.minecraft-server = {
servers = mkOption {
type = with types; attrsOf (submodule serverOpts);
default = {};
};
};
};
config = {
systemd.services = (mapAttrs' generateServerUnit cfg.servers);
};
}