{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.crossfire-server;
serverPort = 13327;
in {
options.services.crossfire-server = {
enable = mkOption {
type = types.bool;
default = false;
description = ''
If enabled, the Crossfire game server will be started at boot.
'';
};
package = mkOption {
type = types.package;
default = pkgs.crossfire-server;
defaultText = literalExpression "pkgs.crossfire-server";
description = ''
The package to use for the Crossfire server (and map/arch data, if you
don't change dataDir).
'';
};
dataDir = mkOption {
type = types.str;
default = "${cfg.package}/share/crossfire";
defaultText = literalExpression ''"''${config.services.crossfire.package}/share/crossfire"'';
description = ''
Where to load readonly data from -- maps, archetypes, treasure tables,
and the like. If you plan to edit the data on the live server (rather
than overlaying the crossfire-maps and crossfire-arch packages and
nixos-rebuilding), point this somewhere read-write and copy the data
there before starting the server.
'';
};
stateDir = mkOption {
type = types.str;
default = "/var/lib/crossfire";
description = ''
Where to store runtime data (save files, persistent items, etc).
If left at the default, this will be automatically created on server
startup if it does not already exist. If changed, it is the admin's
responsibility to make sure that the directory exists and is writeable
by the `crossfire` user.
'';
};
openFirewall = mkOption {
type = types.bool;
default = false;
description = ''
Whether to open ports in the firewall for the server.
'';
};
configFiles = mkOption {
type = types.attrsOf types.str;
description = ''
Text to append to the corresponding configuration files. Note that the
files given in the example are *not* the complete set of files available
to customize; look in /etc/crossfire after enabling the server to see
the available files, and read the comments in each file for detailed
documentation on the format and what settings are available.
Note that the motd, rules, and news files, if configured here, will
overwrite the example files that come with the server, rather than being
appended to them as the other configuration files are.
'';
example = literalExpression ''
{
dm_file = '''
admin:secret_password:localhost
jane:xyzzy:*
''';
ban_file = '''
# Bob is a jerk
bob@*
# So is everyone on 192.168.86.255/24
*@192.168.86.
''';
metaserver2 = '''
metaserver2_notification on
localhostname crossfire.example.net
''';
motd = "Welcome to CrossFire!";
news = "No news yet.";
rules = "Don't be a jerk.";
settings = '''
# be nicer to newbies and harsher to experienced players
balanced_stat_loss true
# don't let players pick up and use admin-created items
real_wiz false
''';
}
'';
default = {};
};
};
config = mkIf cfg.enable {
users.users.crossfire = {
description = "Crossfire server daemon user";
home = cfg.stateDir;
createHome = false;
isSystemUser = true;
group = "crossfire";
};
users.groups.crossfire = {};
# Merge the cfg.configFiles setting with the default files shipped with
# Crossfire.
# For most files this consists of reading ${crossfire}/etc/crossfire/${name}
# and appending the user setting to it; the motd, news, and rules are handled
# specially, with user-provided values completely replacing the original.
environment.etc = lib.attrsets.mapAttrs'
(name: value: lib.attrsets.nameValuePair "crossfire/${name}" {
mode = "0644";
text =
(optionalString (!elem name ["motd" "news" "rules"])
(fileContents "${cfg.package}/etc/crossfire/${name}"))
+ "\n${value}";
}) ({
ban_file = "";
dm_file = "";
exp_table = "";
forbid = "";
metaserver2 = "";
motd = (fileContents "${cfg.package}/etc/crossfire/motd");
news = (fileContents "${cfg.package}/etc/crossfire/news");
rules = (fileContents "${cfg.package}/etc/crossfire/rules");
settings = "";
stat_bonus = "";
} // cfg.configFiles);
systemd.services.crossfire-server = {
description = "Crossfire Server Daemon";
wantedBy = [ "multi-user.target" ];
after = [ "network.target" ];
serviceConfig = mkMerge [
{
ExecStart = "${cfg.package}/bin/crossfire-server -conf /etc/crossfire -local '${cfg.stateDir}' -data '${cfg.dataDir}'";
Restart = "always";
User = "crossfire";
Group = "crossfire";
WorkingDirectory = cfg.stateDir;
}
(mkIf (cfg.stateDir == "/var/lib/crossfire") {
StateDirectory = "crossfire";
})
];
# The crossfire server needs access to a bunch of files at runtime that
# are not created automatically at server startup; they're meant to be
# installed in $PREFIX/var/crossfire by `make install`. And those files
# need to be writeable, so we can't just point at the ones in the nix
# store. Instead we take the approach of copying them out of the store
# on first run. If `bookarch` already exists, we assume the rest of the
# files do as well, and copy nothing -- otherwise we risk ovewriting
# server state information every time the server is upgraded.
preStart = ''
if [ ! -e "${cfg.stateDir}"/bookarch ]; then
${pkgs.rsync}/bin/rsync -a --chmod=u=rwX,go=rX \
"${cfg.package}/var/crossfire/" "${cfg.stateDir}/"
fi
'';
};
networking.firewall = mkIf cfg.openFirewall {
allowedTCPPorts = [ serverPort ];
};
};
}