nixpkgs/nixos/modules/services/databases/4store.nix
Eelco Dolstra 29027fd1e1 Rewrite ‘with pkgs.lib’ -> ‘with lib’
Using pkgs.lib on the spine of module evaluation is problematic
because the pkgs argument depends on the result of module
evaluation. To prevent an infinite recursion, pkgs and some of the
modules are evaluated twice, which is inefficient. Using ‘with lib’
prevents this problem.
2014-04-14 16:26:48 +02:00

75 lines
1.6 KiB
Nix

{ 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 = "filesystem";
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}'
'';
};
};
}