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{ config, lib, pkgs, ... }:
let
cfg = config.services.fourStore;
stateDir = "/var/lib/4store";
fourStoreUser = "fourstore";
run = "${pkgs.su}/bin/su -s ${pkgs.stdenv.shell} ${fourStoreUser}";
in
with lib;
{
###### interface
options = {
services.fourStore = {
enable = mkOption {
default = false;
description = "Whether to enable 4Store RDF database server.";
};
database = mkOption {
default = "";
description = "RDF database name. If it doesn't exist, it will be created. Databases are stored in ${stateDir}.";
};
options = mkOption {
default = "";
description = "Extra CLI options to pass to 4Store.";
};
};
};
###### implementation
config = mkIf cfg.enable {
assertions = singleton
{ assertion = cfg.enable -> cfg.database != "";
message = "Must specify 4Store database name.";
};
users.extraUsers = singleton
{ name = fourStoreUser;
uid = config.ids.uids.fourstore;
description = "4Store database user";
home = stateDir;
};
services.avahi.enable = true;
jobs.fourStore = {
name = "4store";
startOn = "ip-up";
preStart = ''
mkdir -p ${stateDir}/
chown ${fourStoreUser} ${stateDir}
if ! test -e "${stateDir}/${cfg.database}"; then
${run} -c '${pkgs.rdf4store}/bin/4s-backend-setup ${cfg.database}'
fi
'';
exec = ''
${run} -c '${pkgs.rdf4store}/bin/4s-backend -D ${cfg.options} ${cfg.database}'
'';
};
};
}
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