29027fd1e1
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.
75 lines
1.6 KiB
Nix
75 lines
1.6 KiB
Nix
{ config, lib, pkgs, ... }:
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let
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cfg = config.services.fourStore;
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stateDir = "/var/lib/4store";
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fourStoreUser = "fourstore";
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run = "${pkgs.su}/bin/su -s ${pkgs.stdenv.shell} ${fourStoreUser}";
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in
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with lib;
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{
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###### interface
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options = {
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services.fourStore = {
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enable = mkOption {
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default = false;
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description = "Whether to enable 4Store RDF database server.";
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};
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database = mkOption {
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default = "";
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description = "RDF database name. If it doesn't exist, it will be created. Databases are stored in ${stateDir}.";
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};
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options = mkOption {
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default = "";
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description = "Extra CLI options to pass to 4Store.";
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};
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};
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};
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###### implementation
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config = mkIf cfg.enable {
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assertions = singleton
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{ assertion = cfg.enable -> cfg.database != "";
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message = "Must specify 4Store database name.";
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};
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users.extraUsers = singleton
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{ name = fourStoreUser;
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uid = config.ids.uids.fourStore;
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description = "4Store database user";
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home = stateDir;
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};
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services.avahi.enable = true;
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jobs.fourStore = {
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name = "4store";
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startOn = "filesystem";
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preStart = ''
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mkdir -p ${stateDir}/
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chown ${fourStoreUser} ${stateDir}
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if ! test -e "${stateDir}/${cfg.database}"; then
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${run} -c '${pkgs.rdf4store}/bin/4s-backend-setup ${cfg.database}'
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fi
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'';
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exec = ''
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${run} -c '${pkgs.rdf4store}/bin/4s-backend -D ${cfg.options} ${cfg.database}'
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'';
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};
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};
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}
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